Question

currently, i’m adding elements dynamically to my widget using the following:

RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget_design);

RemoteViews newView = new RemoteViews(context.getPackageName(), R.layout.widget_item);
views.addView(R.id.view_container, newView);

but how can I dynamically add margins, weights, and other properties to the added elements?

currently i have tried (using code I have found from different sites):

LinearLayout item = (LinearLayout) ((Activity) context).findViewById(R.id.widgetItem);
MarginLayoutParams marginParams = new MarginLayoutParams(item.getLayoutParams());
marginParams.setMargins(10, 50, 4, 5);
LinearLayout.LayoutParams layoutParams = new LinearLayout.LayoutParams(marginParams);
item.setLayoutParams(layoutParams);

but this force-closes

LogCat:

09-10 22:01:55.283: ERROR/AndroidRuntime(30060): FATAL EXCEPTION: main
09-10 22:01:55.283: ERROR/AndroidRuntime(30060):
java.lang.RuntimeException: Unable to start receiver
com.example.test.HomeWidget: java.lang.ClassCastException:
android.app.ReceiverRestrictedContext 09-10 22:01:55.283:
ERROR/AndroidRuntime(30060): at
android.app.ActivityThread.handleReceiver(ActivityThread.java:2821)
09-10 22:01:55.283: ERROR/AndroidRuntime(30060): at
android.app.ActivityThread.access$3200(ActivityThread.java:125) 09-10
22:01:55.283: ERROR/AndroidRuntime(30060): at
android.app.ActivityThread$H.handleMessage(ActivityThread.java:2083)
09-10 22:01:55.283: ERROR/AndroidRuntime(30060): at
android.os.Handler.dispatchMessage(Handler.java:99) 09-10
22:01:55.283: ERROR/AndroidRuntime(30060): at
android.os.Looper.loop(Looper.java:123) 09-10 22:01:55.283:
ERROR/AndroidRuntime(30060): at
android.app.ActivityThread.main(ActivityThread.java:4627) 09-10
22:01:55.283: ERROR/AndroidRuntime(30060): at
java.lang.reflect.Method.invokeNative(Native Method) 09-10
22:01:55.283: ERROR/AndroidRuntime(30060): at
java.lang.reflect.Method.invoke(Method.java:521) 09-10 22:01:55.283:
ERROR/AndroidRuntime(30060): at
com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:858)
09-10 22:01:55.283: ERROR/AndroidRuntime(30060): at
com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616) 09-10
22:01:55.283: ERROR/AndroidRuntime(30060): at
dalvik.system.NativeStart.main(Native Method) 09-10 22:01:55.283:
ERROR/AndroidRuntime(30060): Caused by: java.lang.ClassCastException:
android.app.ReceiverRestrictedContext 09-10 22:01:55.283:
ERROR/AndroidRuntime(30060): at
com.example.test.HomeWidget.onUpdate(HomeWidget.java:37) 09-10
22:01:55.283: ERROR/AndroidRuntime(30060): at
android.appwidget.AppWidgetProvider.onReceive(AppWidgetProvider.java:61)
09-10 22:01:55.283: ERROR/AndroidRuntime(30060): at
android.app.ActivityThread.handleReceiver(ActivityThread.java:2810)
09-10 22:01:55.283: ERROR/AndroidRuntime(30060): … 10 more

Answer 1

LinearLayout layoutParams = item.getLayoutParams();
layoutParams.setMargins(10, 50, 4, 5);
item.setLayoutParams(layoutParams);

Somehow creating new LayoutParams always causes such error. I think, there remain some fields unset. Only copy the existing ones.